UA 3870 then AA 6214 at San Francisco
Xiamen → San Francisco → Los Angeles
Timetable, San Francisco time
07:49UA 3870 from Xiamen at the gate
15:07AA 6214 to Los Angeles leaves the gatealso IB 8188
7 h 18 apart on the timetable
The last days
UA 3870 and AA 6214 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.